package com.xcjw.com.Utils;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;

import java.util.Random;

/**
 * @packname com.xcjw.com.Utils
 * @filename CodeUtils
 * @date on 2018/11/19 10:51
 *****/

public class CodeUtils {
      private static final char[] CHARS = {
                '1', '2', '3', '4', '5', '6', '7', '8', '9',
                'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
                'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
                'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
                'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
      };

      private static CodeUtils mCodeUtils;
      private int mPaddingLeft, mPaddingTop;
      private StringBuilder mBuilder = new StringBuilder();
      private Random mRandom = new Random();


      //Default Settings
      private static final int DEFAULT_CODE_LENGTH = 4;//验证码的长度
      private static final int DEFAULT_FONT_SIZE = 60;//字体大小
      private static final int DEFAULT_LINE_NUMBER = 3;//多少条干扰线
      private static final int BASE_PADDING_LEFT = 20; //左边距
      private static final int RANGE_PADDING_LEFT = 20;//左边距范围值
      private static final int BASE_PADDING_TOP = 42;//上边距
      private static final int RANGE_PADDING_TOP = 15;//上边距范围值
      private static final int DEFAULT_WIDTH = 200;//默认宽度.图片的总宽
      private static final int DEFAULT_HEIGHT = 100;//默认高度.图片的总高
      private static final int DEFAULT_COLOR = 0xDF;//默认背景颜色值
      private String code;  //验证码图片中的验证码

      public static CodeUtils getInstance() {
            if (mCodeUtils == null) {
                  mCodeUtils = new CodeUtils();

            }
            return mCodeUtils;
      }

      //返回验证码图片中的验证码
      public String getCode() {
            return code;
      }


      //生成验证码图片
      public Bitmap createBitmap(String s) {
            mPaddingLeft = 0; //每次生成验证码图片时初始化
            mPaddingTop = 0;

            Bitmap bitmap = Bitmap.createBitmap(DEFAULT_WIDTH, DEFAULT_HEIGHT, Bitmap.Config.ARGB_8888);
            Canvas canvas = new Canvas(bitmap);

            //生成的验证码
            code = s;
            canvas.drawColor(Color.rgb(DEFAULT_COLOR, DEFAULT_COLOR, DEFAULT_COLOR));
            Paint paint = new Paint();
            paint.setTextSize(DEFAULT_FONT_SIZE);
            for (int i = 0; i < code.length(); i++) {
                  randomTextStyle(paint);
                  randomPadding();
                  canvas.drawText(code.charAt(i) + "", mPaddingLeft, mPaddingTop, paint);
            }

            //干扰线
            for (int i = 0; i < DEFAULT_LINE_NUMBER; i++) {
                  drawLine(canvas, paint);
            }

            canvas.save(Canvas.ALL_SAVE_FLAG);//保存
            canvas.restore();
            return bitmap;
      }

      //生成验证码
      public String createCode() {
            mBuilder.delete(0, mBuilder.length()); //使用之前首先清空内容

            for (int i = 0; i < DEFAULT_CODE_LENGTH; i++) {
                  mBuilder.append(CHARS[mRandom.nextInt(CHARS.length)]);
            }

            return mBuilder.toString();
      }

      //生成干扰线
      private void drawLine(Canvas canvas, Paint paint) {
            int color = randomColor();
            int startX = mRandom.nextInt(DEFAULT_WIDTH);
            int startY = mRandom.nextInt(DEFAULT_HEIGHT);
            int stopX = mRandom.nextInt(DEFAULT_WIDTH);
            int stopY = mRandom.nextInt(DEFAULT_HEIGHT);
            paint.setStrokeWidth(1);
            paint.setColor(color);
            canvas.drawLine(startX, startY, stopX, stopY, paint);
      }

      //随机颜色
      private int randomColor() {
            mBuilder.delete(0, mBuilder.length()); //使用之前首先清空内容

            String haxString;
            for (int i = 0; i < 3; i++) {
                  haxString = Integer.toHexString(mRandom.nextInt(0xFF));
                  if (haxString.length() == 1) {
                        haxString = "0" + haxString;
                  }

                  mBuilder.append(haxString);
            }

            return Color.parseColor("#" + mBuilder.toString());
      }

      //随机文本样式
      private void randomTextStyle(Paint paint) {
            int color = randomColor();
            paint.setColor(color);
            paint.setFakeBoldText(mRandom.nextBoolean());  //true为粗体，false为非粗体
            float skewX = mRandom.nextInt(11) / 10;
            skewX = mRandom.nextBoolean() ? skewX : -skewX;
            paint.setTextSkewX(skewX); //float类型参数，负数表示右斜，整数左斜
//        paint.setUnderlineText(true); //true为下划线，false为非下划线
//        paint.setStrikeThruText(true); //true为删除线，false为非删除线
      }

      //随机间距
      private void randomPadding() {
            mPaddingLeft += BASE_PADDING_LEFT + mRandom.nextInt(RANGE_PADDING_LEFT);
            mPaddingTop = BASE_PADDING_TOP + mRandom.nextInt(RANGE_PADDING_TOP);
      }

}
